Sounds like possibly dirty/faulty idle air control valve or dirty throttle plate.
KeithWeast answered 7 years ago
I had the same thing in my 2007. After about 30miles of driving it ran awesome. After the 600 mile trip I had 33.5mpg
My car at a steady speed fuel shuts off like a jog in and out while driving occasionally. Then it idles high all the time in park. And turn on the air and it smothers out.
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